日本金属学会誌

J. Japan Inst. Metals, Vol. 69, No. 8 (2005),
pp. 581-586

Constitutive Equation in Consideration with Slip-Deformed Martensite after Deforming of Ti-Ni Shape Memory Alloy

Toshio Sakuma1,, Yuji Mihara2,, Yasuo Ochi2 and Kiyoshi Yamauchi3

1Central Research Institute of Electric Power Industry, Komae 201-8511
2University of Electro-Communications, Chofu 182-8585
3Tohoku University, Sendai 980-8577

Abstract:

The modeling of the transformation and deformation behavior of a shape memory alloy has been investigated in various researchers. However, there are few reports that investigated plastic deformation of shape memory alloys. In case an actual product is designed, the modeling in consideration of plastic deformation is indispensable. In this work, plastic deformation after pre-deformation is considered using the volume fraction of slip-deformed martensite. New kinetics and constitutive equations for the reverse transformation process are proposed. The material constants in the proposed equations are determined from the results of tensile and heating/cooling tests on Ti-50 at%Ni alloy. The calculated results describe well the deformation and transformation behavior affected by pre-strain.


(Received 2005/2/22)

Keywords:

constitutive equation, kinetics, shape memory alloy, titanium-nickel alloy, residual martensite volume fraction, pre-deforming


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